Weft detector on loom transferrer mechanism



Oct. 26 1926. 1,604,258

A. J. CHEVRETTE WEF'I DETECTOR ON LOOM TRANSFERRER MECHANISM Filed April 24. 1925 122w nto rq 3 #0011377 Jam F5772 Jag-i, F57,

* Wiawm Patented Oct. 26, 1926.

UNITED STATES 1,604,258 PATENT OFFICE.

AUG'USTIN J. OHEVRETTE, OF WORCESTER, MASSAQI-IUSETTS, ASSIGNOR TO CROMPTON 8c KNOWLES LOOM WORKS, OF WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

WEFT DETECTOR ON LOOM TRANSFERRER MECHANISM.

Application filed April 24, 1925.

This invention relates to improvements in loom weft detectors of the type which are mounted on a regularly moving bobbin transferrer mechanism and an object of the invention is to provide an improved form of detector which shall not be sensitive to slight variations in the position of the detecting surface.

In detectors of the type specified there is usually employed a longitudinally movable plunger which is moved by a weft detecting element into the path of an indicating lever on the magazine. Under normal conditions the plunger is out of operating position and has no action on the lever but at indication the plunger is pushed outwardly in position to oscillate the lever. It has been found that in detectors of this type the member carrying the detecting surface is subject to slight movements which are likely to impart more or less motion to the plunger causing uncertain action of the latter with respect to the indicating lever, and it is a further object. of my invention to provide a plunger which will be undisturbed by slight nonindicating movements of the detector but which will be given a quick definite movement when the detector is given a complete indicating motion,

It is a further object of my invention to look a spring pressed indicating lever in inoperative position and to unlock it at indication of weft exhaustion to move to operative position and it is a still further object of the invention to provide positive means for resetting the plunger independently of the indicating lever by means which engage a relatively stationary device on the magazine.

lVith these and other objects in view which will appear as the description proceeds, my invention resides in the combination and arrangement of parts hereinafter described and set forth in the claims.

In the accompanying drawings Fig. 1 is a central vertical section through a multicolor weft replenishing magazine having my invention applied thereto and looking forwardly with respect to the loom,

Fig. 2 is an enlarged view of the transferrer arm showing the same in section and illustrating the position the parts assume when indicating substantial weft exhaustion,

Fig. 3 is a vertical section on line of Flg. 2,

Serial No. 25,643.

Fig. 4 is a detail elevation of the indicatlng lever looking in the direction of arrow 4, Fig. 1, and

Fig. 5 is a fragmentary top plan view of the transferrer arm looking in the direction of arrow 5, Fig. 2.

Referring more particularly to the draw ings it will be seen that I have provided a loom stand 10 on which is mounted a magazine frame 11 having a stud 12 on which is mounted for angular movement a trans ferrer arm 13. The magazine is of the type shown in prior patent to Ryon No. 1,372,316, and has a fixed stud 14 on which is pivotally mounted an indicating lever 15 having a downwardly depending arm 16 and a horizontally extending arm 17 by means of which the indication of weft exhaustion is conveyed to the magazine.

A stud 18 is fixed to the transferrer 13 and is connected to the upper end of a regularly reciprocating link 19 by means of which the transferrer is brought downwardly on every second pick of the loom when the shuttle is on the transferrer' side of the loom. That portion of the transferrer arm which extends over the shuttle is provided with a vertical slot 20 located between front and rear walls 21 and 22, respectively, of the transferrer. Extending between the walls is a stud 23 on which is pivotally mounted a detector lever 24 having the inner end thereof provided with an adjusting set screw 25 and an offset actuating lug 26. The outer end of the lever 24 has pivotally connected thereto as at 27 a weft detector 28 the upper end of which is provided with a stop screw 29 to engage a stop 30 on the arm 24. The lower end of the detector 28 is provided with a roughened detecting surface 31 which is normally offset laterally from the pivot 27. A hook 32 is adjustably mounted in an upstanding horn 33 on lever 24 and receives one end of a tension spring 34 the other end of which is secured to the upper end of the detector 28 and holds the latter normally in the position shown in Fig. 1 with the screw 29 against the stop 30. A yielding trip 35 is positioned to engage the lug 26 when the transferrer descends.

In order to hold the lever 24 and detector 28 in normal raised position as shown in Fig. 1 I provide said lever with a hub 36 surrounded by a coiled spring 37 one end of which is received by the lever 24 and the other end of which is received in the wall 21 as shown in Fig. 5. As the transferrer is moved downwardly the lug 2G is brought into contact with yielding trip and if suilicient yarn for continued weaving is presentthe trip will be depressed but if insuilicient yarn be present the trip will remain in raised position and as the transferrer continues to descend the detector 28 will move to the position shown in Fig. 2. The matter thus far described is substantially the same as set forth in the aforesaid patent and forms no part of my present invention.

In carrying out my invention I drive a sleeve into the transferrer arm and mount therein aplunger 41 the inner end of which is positioned for engagement with the lever 16 and the outer end of which has threaded therein a pin 42 having a conical head 43. Said pin is guided in an open bearing 44 secured to one of the walls of the transferrer arm. A compression spring 45 is interposed between the bearing 44 and the plunger 41 and serves normally to move said plunger toward operative position, or from the position shown in Fig. 1 to the position shown in Fig. 2. For the purpose of holding said plunger in inoperative position I provide the transferrer arm with a web '(3 to the upper surface of which is secured as by riveting a leaf spring 47 having welded thereto a trigger 48 positioned normally to lie behind the conical head 43 and hold said plunger 41 inwardly in its normal position as shown in Fig. 1.

A resetting lever 49 is pivoted as at 50 to the wall 21 and has depending therefrom fingers 51 (see Fig. 3) which lie behind the head 43 and are held against bearing 44 by compression spring 45 when the parts are in the position shown in Fig. 2. The upper end of the lever 49 is provided with a cam face 52 which is adapted to engage a roll rotatably supported by an adjustable mount ing 54. movable in a direction parallel to the plunger 41 on one of the tie rods 55 formed as usual parts of the stationary magazine.

Under normal conditions the lever 49 will assume the position shown in Fig. 1 and the plunger 41 will be held inwardly by interengagement of the trigger 4S and the head 43. It is found that as the transferrer descends the detector is subject to more or less lateral. motion on its pivot, but with the parts as shown herein said lever may have considerable movement without disturbing the plunger. lVhen insutlicient weft remains on the bobbin however, the transferrer, when descending, will cause engagement of the lug 26 and trip 35, and the latter will not be depressed but the detector 28 will be moved along the bobbin in the direction of the length of the'plunger. This movewhich the detector is pivoted.

ment will be accompanied by a downward movement of that part of the lever to As said lever descends it will engage the upper rounded end of the leaf spring 47 and depress the same until trigger 48 moves below the head 43, at which time spring 45 will expand to move the plunger to the position shown in Fig. 2. This motion of the plunger will move the lever 49 to the position shown in Fig. 2 because of the engagement of the fingers 51 with the head 43. As the transfer rer arm moves upwardly the plunger 41 will engage the lever 16 and give the same a right hand oscillation which will impart an operative movement to the replenishing mechanism in the manner set forth in the aforesaid patent. As the transferrer arm continues to move upwardly the cam face 52 will be engaged by the roll 50 to restore said lever 49 to normal position and cause the lini'iers 51 to move head 43 beyond the trigger 48 so that the latter may spring upwardly into a holding position and retain the plunger.

From the foregoing it will be seen that 1 have provided a detector for a regularly moving transferrer wherein the plunger which cooperates with the indicating lever is not moved to indicating position until the pivoted detector receives its full motion, this construction permitting said detector to receive slight and incomplete detecting movements without resulting in uncertain actuation of the replenishing mechanism. Also, the spring pressed plunger is locked in inoperative position and unlocked at indication of weft exhaustion to move to operative position.

Having thus described my invention it will be apparent that changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention, and I do not wish to be limited to the details herein disclosed. but what I claim is:

1. In a weft replenishing mechanism for looms, a regularly reciprocating transferrer arm, an indicating lever movable about a relatively fixed pivot, and a spring pressed plunger carried by said arm normally locked out of operative position with respect to the indicating lever and unlocked at substantial weft exhaustion to move into operative relationship with respect to the indicating lever.

2. In a weft replenishing mechanism for looms, a regularly reciprocating transferrcr arm, an indicating lever for the replenishing mechanism, a device mounted on the arm tending normally to move into operative position with respect to the lever, a lock to hold said device normally out of operative position with respect to the lever, and means to move said look at substantial weft exhaustion to release said device so that the same may move into operative position with said lever and engage the latter as the transterrer arm moves.

3. In a weft replenishing mechanism for looms, a regularly moving translerrer arm, an indicating lever tor the replenishing mechanism, a device carried by the arm and movable thereon toward the lever, a lock to hold said device away from said lever, resilient means to move said device toward the lever and hold said device against the lock, and means to ll'lOv'Q said lock to unlocking position at substantial exhaustion to release said device so that the resilient means can move the device toward said lever.

4. In a weft replenishing mechanism having a regularly reciprocating transferrer and an actuable indicating lever, a wctt de tector mounted on the trans'terrer, a spring pressed plunger slidably mounted on the trans'lerrcr and normally out of operative position with respect to the indicator lever, a trigger to hold said plunger out of operative position with respect to the lever, and means operative at the end of a complete indicating movement of the detector to move said trigger to plunger releasing position.

5. In a weft replenishing mechanism having a regularly reciprocating transt'errer and an actuable indicating lever, a plunger to cooperate with the lever, a trigger holding said iilunger normally out of operative position with respect to the lay, resilient means acting to move said plunger into operative relationship with respect to the lever, and means to move said trigger to plunger releasing position at the end of a complete detecting movement only of said detector.

(5. In a weij't replenishing mechanism having a regularly reciprocating trai'isterrer and an indicatii'ig lever, a wett detector mounted on the transl'errer movable angularly with respect to the transferrer to indi ate wei't exhaustion, a plunger slidable in the transferrer, a trigger to hold said plunger normally out of operative relation with respect to the indicating lever, resilient means tending to move said plunger into operative relation with respect to the indicating lever, and means operative at the limit of angular movement only of the detector to release the trigger so that the resilient means will move said plunger into operative relation with respect to the indicating lever.

7. In a weft replenishing mechanism having a regularly reciprocating transterrer arm, an indicating lever for the replenishing mechanism, a detector lever pivotally mounted on the arm, a plunger slidably mounted on the arm, means tending to move said plunger toward the indicating lever, a trig ger to hold said plunger normally away from said indicating lever, a yieldable mounting for the trigger normally spaced from the detector lever, and a detector carried by said detector lever movable at indication of sub stantial exhaustion to effect engagement of the detector lever and mounting for the trigger to release the plunger.

8. In a weft detector for loom Weft replenishing mechanism, a regularly reciprocating trans'terrer arm, a weft detector carried thereby and movable therewith, an indicating lever for the replenishing mechanism, a plunger mounted on the transferrer arm normally withdrawn from said indicating lever, a lock to hold said plunger withdrawn, and resilient means tending to move said plunger into operative position with respect to the indicating lever and tending also to hold said detector normally in inoperative position, said detector at indication of substantial exhaustion unlocking said plungerso that the same may move into operative position with respect to the indicating lever.

In testimony whereol- I have hereunto affixed my signature.

AUGUSTIN J. CHEVRETTE. 

